Abstract：In order to improve the coupling performance of rotary transformer and reduce the size of the core, this paper proposes a new type of rotary loosely-coupled transformer using nanocrystalline strip as the core material, which is used to supply power for rotating equipment. Based on the measurement system of high-frequency magnetic property in the laboratory, the magnetic properties of soft magnetic ferrite and nanocrystalline strip under the excitations of sine and square waves were measured and analyzed. Nanocrystalline strip was employed to replace the bulk soft magnetic ferrite as a rotary loosely-coupled transformer core material. Due to the change of core material shape, the traditional pot core structure of rotary loosely-coupled transformer is no longer suitable for nanocrystalline core, and then in this paper, two new structures of rotary loosely-coupled transformer were proposed. Based on magnetic field numerical simulation platform, this paper analyzed the transient characteristics of these two rotary loosely coupled-transformer under actual conditions, calculated the coupling factor and core loss, and discussed the feasibility of the above-mentioned rotary loosely-coupled transformer core structure and the corresponding winding structure, which provides a new idea for the performance improvement of the rotary loosely-coupled transformer.
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